On Fri, 16 Mar 2001, Jeroen Ruigrok/Asmodai wrote:
> -On [20010310 04:00], Nick Rogness ([EMAIL PROTECTED]) wrote:
> >
> >Is anyone working on route caching functionality within FreeBSD? This
> >would eliminate a lot of problems with using FreeBSD as a router...which
> >seems to be a common role of which FreeBSD seems to fit. Especially for
> >machine that are dual-homed.
>
> Correct me if wrong, but if I recall BSD natively already held a route
> cache, although it might not be the best route cache which we could come
> up with.
Well, I'm sure it does have some route cache functionality but not
what is considered to be useful.
I'll clarify real quick for people who are asking 'why?'. Bare
with me. As a packet comes in one interface, there should be a
way when the packet comes back out to be sent out that same
interface it was received on, regardless of what the default route
says.
For dual-homed hosts, this is a problem because your packet gets
sent out the default gateway, which may or may not get filtered
upstream. This is usually solved by running a routing deamon but
most upstreams won't allow you to do that anyway (cable,dsl,etc).
There is a workaround solution involving natd but it is a pain in
the butt.
> I'll add this to my todo as well.
I've had some ideas on how someone would implement this. The more
I think about it the more I think it should be similar to
natd. The packet could be diverted like:
ipfw divert route-cached ip from any to any in via ed0
or something similar. route-cached could be a userland program,
like natd, with options:
- setting different gateways for different interfaces
- hold down timers ,etc
Routes could be added into the routing table accordingly as
packets come and go via this daemon. You or someone will have to
validate this logic. I may be way off course here...but it was a
stab. Maybe it belongs somewhere else.
I've been preparing to write such a program, going off the base of
natd. Please let me know if this is a good idea or not.
Nick Rogness <[EMAIL PROTECTED]>
- Keep on routing in a Free World...
"FreeBSD: The Power to Serve!"
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